A case of new-onset cardiomyopathy and ventricular tachycardia in a patient receiving ibrutinib for relapsed mantle cell lymphoma.

Ibrutinib is a first-in-class inhibitor of Bruton's tyrosine kinase, which is approved for use in chronic lymphocytic leukemia, mantle cell lymphoma, and Waldenstrom's macroglobulinemia. Although ibrutinib has been linked to an increased incidence of atrial fibrillation, this is the first report of an association with nonischemic cardiomyopathy and ventricular arrhythmia.